Ultimate greymatter | Ben 10 action figures, Ben 10, Ben 10 ultimate alien
Grey Matter | Ben 10 Ultimate Wiki | Fandom
Amazon.com: Figures Based on Ben 10 Action Figures - Set of 9 Toys [Ben Tennyson, Four Arms, Grey Matter, Kineceleran, Diamondhead, Hex, Steam Smythe, Cannonbolt, Heatblast] : Toys & Games